Electrical regenerative control apparatus and system.



J. G, MAGPARLANE & H. BURGE. ELECTRICAL EEGENBRATIVE CONTROL APPARATU$ AND SYSTEM.

APPLICATION TILED THIS, 7, 1910.

Patented Jan. 10, 1911.

"ascsasx .niotors may be automatically diminished ,En land,. have invented certain new and B of the motor-generator.

there will be 200 volts across 4 UNITED swag JAMES COLQUHQUN' ABC WORKS, ,GHELMSFOBD, ENGLAND.

nnsormoan nnennnna rrvn s rea sm? OFFICE.

MAGFARLANE AND HARRY BURGE, ENGLAND, ASSIGNORS TO THE FIRM 0F CBOMPTON Specification of Letters Yate'nt.

or ABC wonxs, onnmrsro'nn,

CONTROL APP'AB'QUS AND SYSTEK.

7 Application filed February 7, 1910. Serial No. 542,481.,

To all whom itm'ay comm:

Be it known that we, James Comonomv Mac-mullahs and HARRY Boson, subjects of the Kin of Great Britain, residing at Arc Works, Dhelmsford, in the county of Essex,

use t ul Improvements in Electrical Regenerw tive Control Apparatus and Systems, of which the followin is a specification.

This invention re ates to improvements in electrical regenerative control apparatus and systems, such for example as are a plied to trains, tramway cars, omnibu'ses, y ivheel storage systems, and the like, and theinvention has for object to provide means for automatically strengthenlng the fields of the motors during the period of negative acceleration so that the regenerative or electrical braking tendency is largely increased, and the invention also has -for object to rovide means whereby the field strength 0 the during the periods-of acceleration so that the acceleration is" augmented.

According to the invention the apparatus consists of a motor-generator and of one or more motors, alleoupled together on the well-known \Vard-Leonard system.

The accompanying drawing shows diagrmmnatically the application of the invention to a Ward Leonard system arranged with the dynamo of the motor generator and the two working motors all placed in series across the line.

In the drawing, A and B are two elements of a inotiu -generator and C and D are a pair of motors coupled in series with each other and with the generator element E is a reversible shunt regulator controlling the fields K of the generator element B of the motor generator in such manner that any voltage from zero to approximately twice the suppl voltage V can'be impresse on the motors and D.

Assuming that the voltage of supply V is say 100 volts, then when the dynamo Bv without excitation there will be 100 volts across the motors C and D. When the dynamo is fully excited in the positive sense the'motors and as to assist the or inary there will be no volts on the motors. The motors C and D are so designed that with the excitation due to the constant excitation windings H, they will run at normal speed when supplied withcurrent at twice the nor- 'mal voltage, in this case 200 volts.

If the motors C and 'D are provided with constant excitation windings H, it is obvious that when the motors are running at a certain speed, it the field winding K of the generator element B is altered in stren th in silch a we that the motors C and' lose speed, sai motors will tend to regenerate, that is. to say the? will tend to return current to the line. I the strength of the field windin K oithe generator element B is altered-1n the opposite sense to the above, the s eed of the revolving ,parts of the motors (g and D will be accelerated. Thisregenerative or electrical braking tendeneyumd also the acceleration are capable oft being considerabl augmented if during such periods the fiel strength of the motors C'and D is at the same time increased or diminished, as the case may be. a I

In order to provide. means for automatically strengthenin the'fields of the motors C and D durin tie period of negative acceleration and in automatically diminishing the field strength of said motors during periods of ositive acceleration, both the motors C an .D are provided with auxiliary shunt or regulatin windings 'F, arranged so shunt windin and coupled as shown diagrammatical y in the drawing. The said auxiliary windings are con led in series and'joined in shunt across t e dyna'mo'B and one motor C.

It will be' observed-that when the impressed voltage on the motors is double the ine voltage and the motors are running at 7 full speed the potential difference endear thehutiliary shunt-or regulating windings F is approximately zero,'a.nd there fore the gneto-moti' e-iorees exerted by these windings Fare approximatel ;zero.

When the impressed voltage on t motors is zero and the motors are at rest the potential difference across the ends of the wind- ,ings F is a'maximum and therefore the magwhen fully excited in the negative; sense.

F are a maximum. In'otherwords, the mag- Patented J an. 10, 1911.

neto-jmotive-forces exerted by thewindings AND COMPANY LIMITED, 01? 4 

